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Effects of the Assessment of 4 Determinants of Structural Geometry on QCT- and DXA- Derived Hip Structural Analysis Measurements in Elderly Women  Benjamin.

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Presentation on theme: "Effects of the Assessment of 4 Determinants of Structural Geometry on QCT- and DXA- Derived Hip Structural Analysis Measurements in Elderly Women  Benjamin."— Presentation transcript:

1 Effects of the Assessment of 4 Determinants of Structural Geometry on QCT- and DXA- Derived Hip Structural Analysis Measurements in Elderly Women  Benjamin C.C. Khoo, Keenan Brown, Kathy Zhu, Roger I. Price, Richard L. Prince  Journal of Clinical Densitometry  Volume 17, Issue 1, Pages (January 2014) DOI: /j.jocd Copyright © 2014 The International Society for Clinical Densitometry Terms and Conditions

2 Fig. 1 Illustration of the measures W, σ and δ in relation to the mineral mass projection profile, where W is the periosteal width, sigma (σ) is the standard deviation of a normalized mineral mass projection profile distribution, and delta (δ) the displacement between the centre of mass and the geometric center of a mineral mass projection profile induced by the asymmetry of the mineral mass projection profile. Mineral mass projection profile provides an indication of the “compressed” mineral masses (trabecular and cortical), as in a projection from X-rays traversing from left to right of image. The 2 peaks in the mineral mass projection profile are representative of the cortex of the structure in the image. Journal of Clinical Densitometry  , 38-46DOI: ( /j.jocd ) Copyright © 2014 The International Society for Clinical Densitometry Terms and Conditions

3 Fig. 2 Bland-Altman plots of before and after cross-calibrations for cohort B values (panels A and B) aBMD and (panels C and D) CSA. Diff (vertical axis) defined as (QCT-derived−DXA-derived) and mean (horizontal axis) defined as average of QCT-derived and DXA-derived. aBMD, areal bone mineral density; CSA, cross-sectional area. Journal of Clinical Densitometry  , 38-46DOI: ( /j.jocd ) Copyright © 2014 The International Society for Clinical Densitometry Terms and Conditions

4 Fig. 3 Bland-Altman plots of before and after cross-calibrations for cohort B values (panels A and B) CSMI and (panels C and D) W. Diff (vertical axis) defined as (QCT-derived−DXA-derived) and mean (horizontal axis) defined as average of QCT-derived and DXA-derived. CSMI, cross-sectional moment of inertia; W, bone width. Journal of Clinical Densitometry  , 38-46DOI: ( /j.jocd ) Copyright © 2014 The International Society for Clinical Densitometry Terms and Conditions

5 Fig. 4 Bland-Altman plots of before and after cross-calibrations for cohort B values (panels A and B) ED and (panels C and D) aCt. Diff (vertical axis) defined as (QCT-derived−DXA-derived) and mean (horizontal axis) defined as average of QCT-derived and DXA-derived. aCt, average cortical thickness; ED, endosteal diameter. Journal of Clinical Densitometry  , 38-46DOI: ( /j.jocd ) Copyright © 2014 The International Society for Clinical Densitometry Terms and Conditions

6 Fig. 5 Bland-Altman plots of before and after cross-calibrations for cohort B values (panels A and B) Z and (panels C and D) BR. Diff (vertical axis) defined as (QCT-derived−DXA-derived) and mean (horizontal axis) defined as average of QCT-derived and DXA-derived. BR, buckling ratio; Z, section modulus. Journal of Clinical Densitometry  , 38-46DOI: ( /j.jocd ) Copyright © 2014 The International Society for Clinical Densitometry Terms and Conditions


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